O-Ethyl methylphosphonothioate
Agent Name
O-Ethyl methylphosphonothioate
Alternative Name
EMPTA
CAS Number
18005-40-8
Formula
C3-H9-O2-P-S
Major Category
Toxic Gases & Vapors
Synonyms
Phosphonothioic acid, methyl-, O-ethyl ester; [ChemIDplus] EMPTA; P-Methylphosphonothioic acid O-ethyl ester; [Merck Index] UN2927
Category
Chemical Weapons
Description
Yellowish liquid; [Merck Index] Light yellow liquid; [Sigma-Aldrich MSDS]
Sources/Uses
Degradation product and precursor of the warfare agent VX; [Merck Index]
Comments
A cholinesterase inhibitor; [Merck Index] Causes burns; Inhalation may cause corrosive injuries to upper respiratory tract and lungs; Toxic by ingestion, inhalation, and skin absorption; Targets the CNS, heart, blood, and eyes; [Sigma-Aldrich MSDS]
Biomedical References
Exposure Assessment
Vapor Pressure
0.318 mm Hg
Explanatory Notes
The Guide in the Emergency Response Guidebook is for "Toxic liquid, corrosive, organic, n.o.s."
Adverse Effects
Toxic Pneumonitis
Yes
Dermatotoxin
Skin burns
Other Poison
Organophosphate
Diseases, Processes, and Activities Linked to This Agent
Diseases
Occupational diseases associated with exposure to this agent: